CVE-2026-48549 PUBLISHED

Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie

Assigner: VulnCheck
Reserved: 21.05.2026 Published: 26.08.2026 Updated: 26.08.2026

Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Nagios Enterprises, LLC.
Product	Nagios Core
Versions	Default: affected affected from 0 to 4.5.13 (excl.)

Vendor	Nagios Enterprises, LLC.
Product	Nagios XI
Versions	Default: affected affected from 0 to 2026R1.5 (excl.)

CVE-2026-48549 PUBLISHED

Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie

Metrics

Product Status

Credits

References

Problem Types